I use Google Analytics on this site (ntietz.com). It’s a piece of code which records data about my visitors and allows me to understand in broad strokes more detail about my audience.
They keep track of at least the following:
This Google Analytics data lets me understand what kinds of people are visiting my site, and especially what content they are interested in. This allows me to create better content and ensure that I am reaching the audience I want to reach. Basically, it drives the decision making behind my work.
In the future, I may release aggregate statistics about my audience, but no personally identifying data will be released.
I am bound by and follow the Google Analytics Terms of Service.